push BKL down into ->put_super

Move BKL into ->put_super from the only caller.  A couple of
filesystems had trivial enough ->put_super (only kfree and NULLing of
s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs,
hugetlbfs, omfs, qnx4, shmem, all others got the full treatment.  Most
of them probably don't need it, but I'd rather sort that out individually.
Preferably after all the other BKL pushdowns in that area.

[AV: original used to move lock_super() down as well; these changes are
removed since we don't do lock_super() at all in generic_shutdown_super()
now]
[AV: fuse, btrfs and xfs are known to need no damn BKL, exempt]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 7901d8cbb9b1..7262e8427c20 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -316,6 +316,8 @@ static void nilfs_put_super(struct super_block *sb)
         struct nilfs_sb_info *sbi = NILFS_SB(sb);
         struct the_nilfs *nilfs = sbi->s_nilfs;
 
+        lock_kernel();
+
         if (sb->s_dirt)
                 nilfs_write_super(sb);
 
@@ -333,6 +335,8 @@ static void nilfs_put_super(struct super_block *sb)
         sbi->s_super = NULL;
         sb->s_fs_info = NULL;
         kfree(sbi);
+
+        unlock_kernel();
 }
 
 /**